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how to enable data sampling after steady state using TUI

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Old   June 7, 2017, 20:18
Default how to enable data sampling after steady state using TUI
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raunak jung pandey
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I am carrying out a transient simulation using TUI.

I need to enable Data Sampling. Say after 10000 iterations or 0.1 sec of the transient simulation.

How to enable data sampling for the following case using only TUI or a journal file.

Thank You
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Last edited by raunakjung; June 7, 2017 at 21:57.
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Old   June 7, 2017, 21:52
Default Not in steady
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Svetlana Tkachenko
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Hello, I was confused by your question initially...

From user manual: "Data Sampling for Time Statistics enables the sampling of data during an unsteady calculation. See Sections 26.12.1 and 26.12.4 for details. "

For transient simulation, use "/solve/set/data-sampling yes 25 ...". It needs a few more words at the end of the command, but they depend on the model you are using, so either "/solve/set/data-sampling yes 25 yes yes yes" or "/solve/set/data-sampling yes 25 yes yes" depending on what models you have on.

It asks everyone these questions:

Data Sampling for Time Statistics? [no] yes
Sampling interval [1] 25

Then for me it is three questions:

Collect statistics for flow shear stresses? [yes]
Collect statistics for flow heat fluxes? [yes]
Collect wall statistics? [yes]

Please try it in GUI first to know what questions it asks, and then copy it over to your commands list.
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Old   June 8, 2017, 03:53
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raunak jung pandey
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Quote:
Originally Posted by Светлана View Post
Hello, I was confused by your question initially...

From user manual: "Data Sampling for Time Statistics enables the sampling of data during an unsteady calculation. See Sections 26.12.1 and 26.12.4 for details. "

For transient simulation, use "/solve/set/data-sampling yes 25 ...". It needs a few more words at the end of the command, but they depend on the model you are using, so either "/solve/set/data-sampling yes 25 yes yes yes" or "/solve/set/data-sampling yes 25 yes yes" depending on what models you have on.

It asks everyone these questions:

Data Sampling for Time Statistics? [no] yes
Sampling interval [1] 25

Then for me it is three questions:

Collect statistics for flow shear stresses? [yes]
Collect statistics for flow heat fluxes? [yes]
Collect wall statistics? [yes]

Please try it in GUI first to know what questions it asks, and then copy it over to your commands list.
Thank you for your answer . I know the GUI to start using data sampling. But data sampling is only started after a statistically steady state has been reached. Hence I would like to start data sampling after 10000 iterations. How to write this using TUI ?
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Old   June 9, 2017, 02:31
Default The whole thing
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Svetlana Tkachenko
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Hi,

Thanks for following up. I thought you were only asking about data sampling, sorry!

I believe you may be able to save your case as steady in GUI, and then specify the following in your commands file.

Code:
 ;; iterates 10,000 iterations in steady state
/solve/iterate 10000
;; switches to unsteady flow
/define models unsteady-1st-order? yes
;; enables data sampling, you might need an extra 'no' here
/solve/set/data-sampling yes 25 no no 
;; does 1000 time steps with 10 iterations in each in transient regime
/solve/dual-time-iterate 1000 10
;; writes your case and data like usual
/file/rcd 2.cas
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Old   June 10, 2017, 15:22
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Omar jumaah
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Quote:
Originally Posted by raunakjung View Post
I am carrying out a transient simulation using TUI.

I need to enable Data Sampling. Say after 10000 iterations or 0.1 sec of the transient simulation.

How to enable data sampling for the following case using only TUI or a journal file.

Thank You
Hi, I suggest you to try to use the Calculation Activities. which allows you to set up various tasks that you can perform during the calculation. opens the Automatic Solution Initialization and Case Modification dialog box, change the no. case modification and include TUI command that you want e.g after 1000 iter.
Hope this will help,
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